Dock Water Allowance DWA

This video is a short presentation of a vessel, on how to get the Dock Water Allowance (DWA) and her draft finding the new draft due to change in density when displacement is constant. The change in draft when a vessel is operating from salt water of density 1.025 t/m3 then to a water density between 1.025 t/m3 (SW) and 1.000 t/m3 (FW), or vice versa, is commonly called the dock water allowance. Dock water allowance is found by simple proportion from FWA formula. Thus, DWA = FWA (1.025 – dd)/25 or DWA = FWA (1.025-dd)/0.025. Like FWA, the DWA is applied as increase in draft when calculating drafts from SW to DW, and the reverse when from DW to SW. DW draft = SW draft + DWA, and SW = DW draft – DWA.

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